What is the best way to alert nearby vessels of potential danger?

Using a danger sound horn is the most effective method for alerting nearby vessels of potential danger because sound signals are universally recognized maritime communication tools. A danger sound horn is designed to convey specific messages, typically indicating that there is a situation requiring immediate attention or caution.

In maritime practice, horn signals are part of internationally accepted rules, such as the International Regulations for Preventing Collisions at Sea (COLREGs), which establish clear meanings for various sound signals. For example, a prolonged blast followed by several short blasts signals distress or danger to others. This allows nearby vessels to understand the nature of the situation quickly and respond appropriately.

In contrast, blinking lights from the vessel may not be easily seen in certain conditions, especially during the day or in bright environments, and do not have a universally understood meaning for indicating danger. Changing speed erratically can be confusing to other vessels and may worsen the situation by failing to provide a clear indication of danger. Navigating away from the area, while potentially safe for the vessel in question, does not actively alert other nearby vessels to the danger present, leaving them unaware of potential risks. Therefore, using a danger sound horn is by far the best way to ensure all nearby vessels are informed of imminent threats.